Friction draft rigging



May 29, `1 923.. A 1,456,974

i G. Es. DOREY I FRICTION DRAFT RIGGING Filed March 17. 1922 2 Sheets-Sheet 2 W/ TNES SES 4Q 4Q. im /NvE/vToR MM ww Patented May 29, 1923.

UNITED STATES 1,456,974 PATENT orifice.

GEORGE :BINET DOREY, OF MONTREAL, QUEBEC, CANADA, ASSIGNOR TO YVILLIAM H. IIIINER, OF CHAZY, NEW YORK.

FR-ICTION DRAFT RIGGING.

Application filed March 17, 1922.

Be it known that l, Gannon BrNnr Donar5 a subject ot the `King` ot (treat Britain, and residing in the city et lvlontreal. Province ot Quebec, Dominion ot Canada1 have invented cert-.iin new and uset'ul improvements in Friction llralt liiggiues, and do hereby declare the 'following to be a it'ull7 clearj and exact description ot' the same.

This invention relates to improvements in friction dralt rigging-s as applied to railway ears and the like and especially to that type wherein friction elements are associated with casings tor the purpose ot creatiner triction,

lt is an object ot the invention to provide expandingr t'riction mechanism to co-act with the interior walls oi a casing and to provide simple means whereby such trictional contact will be positively maintained throughout the travel ot' the trictioual elements. lt is also an object oi the invention to cause such lirictional elements to be displaced a greater distance and at a greater speed than the coupler thereby insuring high resistant capacity with relatively low hearing?T pressures between the friction elements and the casino' walls.

A more specific object of the invention is to provide an expansible Jfriction mechanism adapted to be displaced b v transversely movable members7 and to so dispose the various parts that both the friction mechanism and the transversely movable members will be in substantially the same plane thereby presenting the greatest possible longitudinal space for springs.

A further object of the invention is to cause the friction-al members to engage the casing,r walls at locations where such parts are least subject to bending stresses. An inherent detect in draft riggings utilizing the walls ot rectangular shaped casinos as bearingr surfaces for friction elements has been the liability oiE such elements bending` aud del'lectingr the casing walls outwardly. In this invention this detect has been overcome in the novel manner hereinafter explained.

.lt is also an object ot the invention to facilitate the release oit the gear by having the frictional mechanism so arranged that the coupler may be returned to the normal position independently of the release of the frictional mechanism. 1

With these ends in view and other de- Seral No. 544,458.

tails ot novelty such as will be more particu.. larly pointed out hcreinafl'ter my invention resides in the peculiar construction. arrangements and combination ot parts set Vforth in this siviecitication and claims.

For a 'fuller comprehension ot my invention reference must be had to the accompanyiup; drawings wherein .iilce references indi.- rate like parts-1 and wherein Figure l shows a sectional plan view ol the drailt rigging as applied between the sills of a railway ear.

Figure a. horizontal sectional view of the rigging; showing' the same in the lfully compressed position.

Figure El is. a sectional elevational view of the draflt riga'ine'` taken on line 3-3 of Figure l.

Figure l is an end view ot the draft rigas shown in Fig. 3.

Figure .3 is a horizontal sectional view of the rige-ing' showing the same with the springs partially expanded and the entire trictional mechanism returned to the normal release position as a unit.

Figure C is a perspective view ot the resistancc mechanism shown in assembly relation.

F ig'ure 7 is al perspective view ott the wedge retainingr member, i

Figure 8 is a perspective view o'E the central inwardly movable wedges7 one of these beiner shown in section.

Figure 9 is a perspective view the `friction shoes.

Figure l0 is a perspective View of one of the wedge pressure transmitting members.

Figure l1 is a perspective view ot one ot the liners.

Figure l2 is a sectional perspective view ot the easing' member shown with the liners in assembly relation.

lu the drawings a preferred embodiment ol the invention is shown as applied between the sills ot a railway car, the drawbar ot the coupler 2 being: connected by means ot key 3 to the yoke i in the usual manner, the ,volte emb acinpg the draft ringing and the whole beinel located between the center sills lu the illustration the draft rig;- ,ging is shown as abutting against Yfront stops G secured to the center sills by means of rivets 7. rear stops 8 also secured to the center sills in like manner form stops unde bufiing strains. .l y i The draft rigging consists of a casing 9 of one of fin-5.

i with inserts 10.vvhich act as liners to take Abers are adapted to register.

'anism of the rigging.

the Wear which usually occurs on the casing Walls `and these are loosely mounted Within the casing and preferably channel shaped. Wedge pressure transmittingmembers 11 are ada ated to be acted upon by a follower 12 to displace friction mechanism consisting of central inwardly movable Wedges 13 and outwardly movable shoes 141-. An outer spring 16 is interposed betvveen the casing end Wall and the Wedge retaining; member l5 and the inner springv 17 is interposed between the casing end Wall and the central Wedges 13 directly resisting inward movemcnl of the latter.

The casing 9 which is preferably formed of rectangular shape is provided with the Vliners 10 which are loosely mounted therein and have lips 10"' .vhi-ch abut on the edge of the casing at 9, The liners have interior faces 10b adapted to register with surfaces 1.4 of the shoes 14. The Walls l0b are spaced from each other in order to insure the casing lateral VWalls against bending strains in case the friction shoes should deflect under load. In order to secure the maximum strength in the casingwith the least amount of metal the open space between the liners is disposed substantially the line of greatest bending moment. The liners which are preferably made channel shaped are each provided with a beveled face at 10C with which the surfaces 11a of the pressure memit each side of the said beveled faces a space is provided as at l0d to permit the passage of the shoes lll which normally project beyond the end of the casing. The inner surfaces 11b of the pressure transmtting members 11 register with surfaces 13a of the central wedge members 13 thereby exertingP a squeezing effect on these members and forcing them in- Wardly towards each other and longitudinally .into the casing.

The central Wedge members acting on the shoes to move the same in contact With the interior Walls of the casing and relatively theretoprovide the resistance 'friction mecl1- i Y The central Wedge members are each beveled in a lon.. ritiulinal direction as shown at .13C thereby presenting a V shaped longitudinal recess when the members are placed in operative relation.

The Wedge shaped `portion of the shoes as madeby surfaces 14h t Within the recess made by the inclined surfaces 13 of the cen tra] Wedge members.

The central Wedge members .13 have a dat portion formed .on each side at 1.3" which fengagethe ledges 14 on each of the shoes v'thereby insuring' that both the central wedge members Aand the shoes will move in unison ,during lthe .compression cycle of the riggin.

During the releasing movement of the risiging' the shoes and' Wedge members are also caused to move in unison bv lilaving projections leld of the shoes fitting); Within recesses 13 of the Wedge members. The said re cesses are constructed to permit a limited amount of longitudinal movement between the Wedge members 'and slices in order to facilitate the release of the parts. rlhe recesses are also constructed to permit a certain amount of relative transverse movement between the shoes and central Wedge members and with this end in vievv ample clearance is provided in tbe recesses to permit the shoes and central Wedge members to remain in ivedging engagement as wear ou the shoes takes place.

The inner ends of the central ivedsje mem-` bers are formed with tapered portions as at .13b adapted to register with similarly ta pered surfaces 15a of the Wedge retainingr member l5. The inner face 15b of the Wedge, retainingf member constitutes an abutment for the outer spring 16 While the inner spring` 1.7 entends through the openingr of the Wedge retainingr member and bears directly on the surfaces 125i of the central Wedge memliicrs. rllhe Wedge retaining' member is .formed with a recess at 15c to accommodate the inner spring. ln order to provide the maximum springy space consistent With maximum bearingT area for the shoes the outer side Walls of the ivedn'e retaining meu'ibcr are tapered at Y15d and the inner surfaces of the shoes are also tapered 14"' in a similar manner. The surface 12n of the follower 12 bears on the surface 11c of the Wedge pressure transmittin; members.

When the gear is fully compressed as shown in Figure 2 the surface `12a of the follower abuts on surface 10'3 of the liners.

The operation of the lQ'ear takes place as follows. In draft or builing strains the draft `gear is compressed by relative approach of follower to casing. During such movement the ,Wedge block pressure trans-- mittina members 11 are moved longitudinally into the casing. and' bv reason of the surfaces 13C actingr on the Wedge shaped suv faces 14h of the shoes forcing;r the latter outwardly against the casing Walls, As the los members 13 are moved inwardly the shoes 14 `will also move in unison therewith due to the flat portion 13 bearing on the ledge 14 of the shoes. The wedging action on the central wedging members 13 is further enhanced by the wedge retaining member, which on being acted upon by the outer spring is forced tightly over the wedge shaped ends 13e of the `mem-bers 13.

The disposition of the wedging surfaces in two planes provides for large bearing areas between the friction surfaces in a comparatively short length thereby providing for a very long spring.

The draft rigging being fully compressed and the follower l2 abutting on surface 10 of the casing structure the release of the rigging takes place as follows The inner and outer vsprings expand and the inner sprintr aetingidirectly on the central wedge members tends to break the tight wedgingT contact between these members and the wedge retaining member by moving the former slightly forward and out of the cngagement with the latter. The outer spring bearing on the` wedge retaining' member moves the entire friction mechanism in a forward direction. During such return movement any tendency of the central wedge members to move forward beyond the shoes is prevented by the engagement of projections 14d of the shoes into the recesses 13d of the central wedge members.

In the event of the frietional adherence between the shoes and allied parts beingtoo great to permit relative movement between the shoes and the liners provision has been made for the liners to travel outwardly with the friction mechanism in the manner shown in Figure 5. `When the rig- ,cing releases in this manner it will be noted that the entire friction mechanism consisting of the follower, pressure blocks, central wedge members. friction shoes and wedge retaining member moves forward as a unit withdrawing the liners out of the casing. As the forward movement progresses there is a tendency for the. liners to spring' slightly in an outward direction beincr no longer supported hv the casing at the point of greatest transverse thrust and in this manner the pressure on the wedge block pressure transmitting members is relieved. As soon as this pressure is reduced further expansion of the springs takes place forcing4 the wedge block pressure transmitting members transversely outwardly returning` the liners inwardly into th'e easing and thereby placing the gear in readiness for the next compression cycle.

lVhat I now claim is: i

1. ln a friction draft rigging. the combination with a casing having beveled walls of friction mechanism disposed therein. the said mechanism including friction shoes and merit with certain of the `sides and adapted to maintain frictional elements in engagement with other of the sides and move the same relatively thereto in a longitudinal direction.

In a friction draft rigging. the combination with a drawbar having movement of a casine having a plurality of walls angularly disposed relatively to each other, `pressiu'e transmittinemembers in engagement with certain ofthe. sides and adapted to maintain frictional elements in engagement with the other sides and moveithe said elements a ygreater distance than the drawbar moves.

il.. A. friction draft rigging comprising a casinalongitudinally disposedy in the line of draft and in'esentine` a series of angularly related walls: a plurality of the said walls heine' inclined to the line of draft and relatively to the other walls7 and pressure transwrittingl n'iei'nbers in engagement with the former and adapted to maintain friction mechanism in engagement with the latter and more the same relatively thereto in a longitudinal direction.

5. ln a friction draft rigging, a casing having beveled side walls. lateral walls connecting the same. transversely movable members in engagement with the side walls and friction mechanism including friction shoes adapted to be displaced by the transversely movable members, the said shoes being in frietional engagement with the lateral walls of the casingT and movable relatively thereto and springs for maintaining the parts inV operative relation. i

6. A friction draft rigging comprising aA easing having an open end. loosely mounted liners disposed therein and adapted to abut on the edge of the casing at the open end, such liners presenting cppositely disposed beveled walls` transversely movable wedge elements civ-operating: therewith and friction mechanism adapted to be displaced by movement of the said transversely movable wedge elements.

7. A friction draft rigging comprising a casing structure having oppositely beveled walls, wedge pressure transmitting members in engagement therewith presenting relatively approachable wedging faces adapted to act upon centrally disposed wedges to force the same transversely towards each other and inwardly into the easing,vthe said transverse movement being adapted to exystationary member, included:` friction elements eo-acting therewith, such co-a-ction beingA maintained by centrally disposed wedges adapted to expand the `friction elements against the stationary member, the

-said central wedges each presenting oppositely disposed wedge shaped ends, transversely movable members acting on one end of each wedge and an integral wedge -shaped `movable retaining member acting on the other end thereof, spring means directly resisting inward movement pf thecentral wedges and spring means Adirectly resisting inward movement of the wedge retaining member.

L9. A friction draft rigging comprising a `easing structure presenting beveled walls, pressure transmitting members each having adjacent; surfaces both inclined to the line of draft, one of such surfaces being adapted to register with one of the beveled walls of the casing, frictional mechanism composed ofv a plurality of wedge members each having a Wedge surface inclined to the line of draft and adapted to register with the other surface of one of the pressure transmitting members; the said wedge members each l1aving oppositely inclined surfaces forming a Alongitudinally extending V shaped trough whenthe said members are placed in operative relation, friction shoes having a wedge shaped portion adapted to register with the `longitudinally disposed wedging surfaces.

10. A friction draft rigging comprising a casing presenting bevelled walls and parupon by the wedge block pressure transmitting members and the other wedge surface being actedupon by an integral movable wedge retaining member, the said wedge members when placed in operative relation beingadapted to exert wed'ging action in a` plane at right angles to the line of draft` and force friction shoes against the par` allel walls of the casing, spring means directly resisting inward movement of the wedge retaining member and spring means directly resisting inward movement ofthe wedge n'iembers.

11. A friction draft rigging comprisngfa casing, friction elements movable transversely towards each other .and means where` by such movement operates to force friction shoes outwardly in a plane at right angles to the said transverse movement and means i whereby the parts are caused to move rela tively to the casing in unisonwhile permit-1 ting relative transverse and lateral movement.

In testimony whereof, I have hereunto subscribed my name in the presence of two witnesses.

GEORGE BINETDOREY. Witnesses A. G. LAMONTAGUE, EDGAR G. Dornen. 

